kernel/panic.c: taint: fix debugfs_simple_attr.cocci warnings
authorYueHaibing <yuehaibing@huawei.com>
Fri, 8 Mar 2019 00:26:36 +0000 (16:26 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 8 Mar 2019 02:31:59 +0000 (18:31 -0800)
commit4169680e9f7cdbf893f8885611b3235aeda94224
tree872f4d1ec79495af4f8d0739b78b4a69c1ba80ca
parentc461aed3a423dda442aad38047c3f2bb0f9e2012
kernel/panic.c: taint: fix debugfs_simple_attr.cocci warnings

Use DEFINE_DEBUGFS_ATTRIBUTE rather than DEFINE_SIMPLE_ATTRIBUTE for
debugfs files.

Semantic patch information:
Rationale: DEFINE_SIMPLE_ATTRIBUTE + debugfs_create_file()
imposes some significant overhead as compared to
DEFINE_DEBUGFS_ATTRIBUTE + debugfs_create_file_unsafe().

Generated by: scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci

The _unsafe() part suggests that some of them "safeness
responsibilities" are now panic.c responsibilities.  The patch is OK
since panic's clear_warn_once_fops struct file_operations is safe
against removal, so we don't have to use otherwise necessary
debugfs_file_get()/debugfs_file_put().

[sergey.senozhatsky.work@gmail.com: changelog addition]
Link: http://lkml.kernel.org/r/1545990861-158097-1-git-send-email-yuehaibing@huawei.com
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/panic.c